Stamping and like press



July 3, 1934. M E, DAVls 1,965,071

STAMPING AND LIKE PRESS Filed June 27, 1930 3 Sheets-Sheet l INVENTOR/7Al//?/6 E. DA W5 ATTO RN EYS July 3, 1934. M E DAVIS 1,965,071

STAMPING AND LIKE PRESS Filed June 27, 1930 3 Sheets-Sheet 2 INVENTORATTORNEYS July 3, 11934. M. E. DAVIS STAMPING AND LIKE PRESS Filed June27, 1950 3 Sheets-Sheet 3 INVENTOH ATTORNEYS TnT 1'11- mm(a/mmmumlmnmmalllrmmmz Patented July 3, 1934 UNITED STATES ?ATENT OFFIQ STAMPINGAND LIKE PRESS Application June 27, 1930, Serial No. 464,223

9 Claims.

This invention relates to stamping or like presses.

Heretofore, as such presses have been constructed, the operation of thecutting die against the bed plate has resulted in wearing of an unevensurface upon the bed plate which affects the sharp and true punching ofarticles in such presses. Provisions have heretofore been made foradjusting the bed plates from time to time, but the foregoingdisadvantage is still present due to the fact that it is impractical toadjust the bed plate except after considerable uneven wear has resulted.

The present invention has forits chief object the provision in a pressof a shiftable bed plate and means for automatically shifting the samecontrolled by the strokes of the press whereby the wear on the bed plateis automatically distributed. To attain this end, it is to be understoodthat the shifting movement of the bed plate must be quite small orslight as compared with the size tion are attained in the punch pressshown in the accompanying drawings, and described below. It is to beunderstood that the invention is not limited to the particular formthereof shown and described.

Of the accompanying drawings,

Figure 1 is a side elevation of a punch press embodying the invention;

Figure 2 is a front elevation thereof;

Figure 3 is a sectional plan on line 33 of Figure 2;

Figure 4 is a section on line 4-4 of Figure 1;

Figure 5 is a section on line 55 of Figure 3; and

Figure 6 is a detail sectional view showing the manner in which thepunching die is mounted in the press.

Referring to the drawings, the numeral 10 designates a punch press of aknown type including a plunger 11 actuated by a driven shaft 12 andcontrolled by a foot pedal 13 as will be understood by skilled artisans.The plunger 11, as usual, carries a die 14 and is adapted to move thesame toward and from a bed plate 15. This bed plate usually comprisesmaterial such as wood, fibre, etc.

In accordance with the present invention the bed plate 15 is mounted inthe press 10 so as to be shiftable in its own plane, guides 16, 16 onthe bed frame of the press having the bed plate 15 slidably engagedtherewith (Figure 2) so that the bed plate 15 is movable forwardly andrearwardly. The bed plate may also be adjustable sideways in its ownplane by suitable well-known constructions (not shown).

In order to shift the bed plate 15 automatically, the same may have arack 17 aifixed to one side thereof with which is meshed a pinion 18secured on a shaft 19. This shaft is adapted to be driven in reversedirections by means of reversing bevel gearing including bevel gears 20,20 journaled in shaft 19 and a bevel gear 21 meshed with said gears. Onegear 20 or the other is adapted to be clutched to shaft 19 by clutch 22.Gear 21 is secured on a shaft 23 arranged to be intermittently rotatedin one direction only by means of a ball-clutch 24 (Figure 4).

Clutch 24 may be provided with an operating arm 25 slotted as at 26 anda pin 2'7 engaged in slot 26 is pivoted as at 28 to a pitman 29 operableby an eccentric 30 on the shaft 12 of the press so that upon eachrevolution of the press shaft in performing a punching operation, thebed plate 15 is shifted, the eccentric being arranged on shaft 12 sothat the shifting of the bed plate occurs on a part of the stroke whenthe die is out of engagement with the bed plate.

In its preferred form, the invention contemplates the reversing movementof the bed plate between predetermined limits by automatic control ofclutch 22. To this end the clutch shifting arm 31, which is pivotallysecured as at 32 to a bracket 33, is formed with an integral bell arm34, as shown in Figure 4. The arm 34 is pivotally connected to a collar35 formed integral with a sleeve 36 which is slidably carried on a shaft3'7 fixed to the bottom of the bed plate, in a position parallel to thedirection of movement of the bed, by brackets 38. The end of the sleeve36 opposite the collar 35 is also formed with an integral collar 39, thewhole sleeve assembly being yieldably fixed to the shaft 37 through theagency of suitable means such as a spring pressed pin 40 which isadapted to fit in either one or the other of a pair of shallow recesses41 formed in the shaft.

In order to move the sleeve assembly from forward to back position orvice versa, toggle links 42, 42 are provided which are pivotallyconnected at their centers by an upwardly extending pivot pin 43 so thatthey will slide on the sleeve 36 but will engage with either of thecollars 35 or 39 upon the outward movement of the toggle. One lever 42is pivotally secured as at 44 to a bracket fixed to the bed frame of themachine while the other lever 42 is pivotally fixed as at 45 to one endof a lever 46 pivoted in its length to a bracket 47 fixed to the bedframe. A spring 48 is fastened between the bed frame and the extendingend of the lever 46 so that the toggle levers 42, 42 will be resilientlyheld to one side or the other of dead center.

Fixed to the bed 15 of the machine on brackets or otherwise are a pairof stops 50 which are adapted in the movement of the bed near theopposite ends of its travel to engage with the upwardly extending pivotpin 43 of the toggle levers 42, 42. In this manner the toggle levers aremoved from against one collar up to and slightly past their dead centerposition at which time the spring 48 will cause the toggle to kick overto the other side and against the other collar which will move thesleeve assembly to swing the integral arms 31 and 34 thus reversing theclutch 22 and bed drive.

The spring pressed pin 40 engaging in one or other of the holes 41serves to hold the collar and sleeve assembly either in its forward orback position and thus the clutch in engagement during the time one ofthe stops 50 is moving the toggle levers from engagement with one of thecollars to past dead center at which time the toggle will kick over tothe other side as above described. The kick of the toggle will move thesleeve and collar assembly to the other end of its travel, the pin 40sliding out of engagement with the one recess 41 and into engagementwith the other recess 41 as will be understood.

As seen in Figures 2 and 6 the die 14 is gibbed or otherwise secured tothe press plate or head 1 l and held in position thereon by set screwsso that it can be adjusted laterally thereof.

In operation it will be understood that each time the press is actuatedthe bed plate 15 will be shifted slightly in its own plane a shortdistance from one predetermined limit to the other as defined by stops,the movement of the bed plate being reversed as it reaches one limitwhereupon it moves toward the other limit. It will be apparent that theinvention is not limited in application to the specific formsillustrated and described. Accordingly various other modifications ofthe invention can be resorted to without departing from the spirit ofthe invention or the scope of the appended claims.

What is claimed is:

l. The combination in a cutting or punching press or the like of asupporting frame, a plunger carrying the cutting or punching element forvertically reciprocating said element in a single fixed line of movementin said frame, said punching element being substantially aligned axiallywith the axis ofthe plunger, a work-receiving bed-plate shiftablymounted on said frame against which said cutting and punching elementoperates to cut or punch through the work and over which the work isshifted after each cutting or punching operation to reposition the workfor a succeeding cutting or punching op- 'eration, means forreciprocating said plunger, and means operable upon each actuation ofthe plunger for shifting said bed plate slightly as compared with thesize of the punching element to distribute the wear of the cutting orpunching element uniformly over the entire surface of the bed plate.

2. The combination with a punch press or the like, of a reciprocableplunger carrying a punch, a bed plate over which the work is shiftedafter 'each punching operation and mounted in the press so as to beshiftable in its own plane in opposite directions between predeterminedlimits, and means for distributing wear of the punch on the bed platecontrolled by actuation of the press plunger for shifting said bed plateslightly as compared with the size of the punch upon each actuation ofthe press, whereby successive lines of contact of the punch with the bedplate will overlap, said means being reversible when said bed plate ismoved to one limit or the other.-

3. The combination with a punch press or the like, of a reciprocableplunger carrying a punch, a bed plate over which the work is shiftedafter each punching operation and mounted in the press so as to beshiftable in its own plane in opposite directions between predeterminedlimits, means for distributing wear of the punch on the bed platecontrolled by actuation of the press plunger for shifting said bed platea short distance as compared with the size of the punch upon eachactuation of the press whereby successive lines of contact of the punchwith said bed plate closely overlap, said means being reversible, andmeans controlled by movement of the bed plate to one limit or the otherfor reversing said shifting means.

4. The combination in a punch press or the like of a supporting frame, aplunger carrying a cutting die for vertically reciprocating said die ina single fixed line of movement in said frame, said die beingsubstantially aligned axially with the aXis of the plunger, awork-receiving bed plate shiftably mounted on said frame against whichsaid die is adapted to operate to cut through the work and over whichthe work is shifted after each operation of the punch to reposition thework for a succeeding punching operation, means for reciprocating saidplunger, and means operable upon each actuation of the plunger to shiftsaid bed-plate slightly as compared with the size of the punch wherebysaid die will be operated in succession against said bed plate intolines of contact overlapping one another whereby said bed plate willwear slowly and uniformly.

5. A punch press including a punch, means for reciprocating said punch,a bed plate over which the work is shifted after each punchingoperation, means for distributing wear of the punch on the bed platesynchronized with said punch reciprocating means for shifting said bedplate in its own plane slightly as compared with the size of the punchupon each reciprocation of the punch, whereby successive lines ofcontact of the punch with said bed plate closely overlap, said meansincluding a shaft, means for partially rotating said shaft in onedirection upon each reciprocation of the punch, a rack on said bedplate, a pinion engaging with said rack, reversing clutch meansconnecting said pinion with said shaft, and mechanism operable by themovement of the bed plate to the end of its travel for .automaticallyreversing said reversing clutch means, said mechanism including akick-over toggle linkage.

6. A punch press including a punch, means for reciprocating said punch,a bed plate over which the work is shifted after each punchingoperation, means for distributing wear of the punch on the bed platesynchronized with said punch reciprocating means for shifting said bedplate in its own plane slightly as compared with the size of the punchupon each reciprocation of the punch, whereby successive lines ofcontact of the punch with said bed plate closely overlap, said meansincluding a shaft, means for partially rotating said shaft in onedirection upon 150 ach reciprocation of the punch, a rack on said bedplate, a pinion engaging with said rack, reversing clutch meansconnecting said pinion with said shaft and mechanism operable by themovement of the bed plate to the end of its travel for automaticallyreversing said reversing clutch means.

7. A punch press including a punch, means for reciprocating said punch,a bed plate over which the work is shifted after each punchingoperation, means for distributing wear of the punch on the bed platesynchronized with said punch reciprocating means for shifting said bedplate in its own plane a slight distance as compared with the size ofthe punch upon each reciprocation of the punch whereby successive linesof contact of the punch with said bed plate closely overlap, said meansincluding a shaft, means for partially rotating said shaft in onedirection upon each reciprocation of the punch, a rack on said bedplate, a pinion engaging with said rack, reversing clutch meansconnecting said pinion with said shaft and mechanism for automaticallyreversing said reversing clutch means.

8. A punch press comprising a bed plate over which the work is shiftedafter each punching operation and a punch, plunger means forreciprocating said punch to and from said bed plate in a single fixedline of movement in said press, said punch being substantially alignedaxially with the axis of the plunger means, and means for moving saidbed plate in its own plane a slight distance as compared with the sizeof the punch upon each reciprocation of the punch whereby successivelines of contact of the punch with said bed plate closely overlap todistribute wear of the punch on the bed plate.

9. A punch press comprising a bed plate over which the work is shiftedafter each punching operation and a punch, means for reciprocating saidpunch to and from said bed plate, means for moving said bed plate in itsown plane a slight distance as compared with the size of the punch uponeach reciprocation of the punch whereby successive lines of contact ofthe punch with said bed plate closely overlap for distributing wear ofthe punch on the bed plate, said means including an intermittentlyrotated shaft, a reversible drive between said shaft and said bed plate,kick-over mechanism for reversing said drive, and means on said bedplate for operating said kick-over mechanism.

MAURICE E. DAVIS.

